I kind of review these lower-budget productions on their own "scale", because it just doesn't feel fair to compare them against huge-scale productions.
So, on that premise, I would say this is quite good.
I liked the music, the story was interesting (not super original though), the main cast was good. The script could have been a bit better, and the effects were so-so.

As for the cast, the ML sometimes gave off a bit similar vibe to Song Joong Ki in Vincenzo.
FL was decent as well.
I liked the sensual undertones/attractions shown, without it being overly relied on. Compared to "Embrace in the dark night" that plays heavily on one thing, this is a lot more subtle.

When it comes to what gives it away as a lower-budget production, I would say it is the effects, and the sometimes inconcistencies in the script, especially for time and wardrobe. It was just several scenes where it kind of didn't make sense that they suddenly had different clothes on, or it seemed like they skipped several hours while moving from one scene and location to another, without there being a logical reason for it.